Rock-drill.



. elevation.

UNITED STATES PATENT OEEIOE.

- i WOODrOF PATERSON, NEXV JERSEY.

ROCK-DRILL.

To all whom it may concern Be it known that I, VARREN WOOD, a citizen ofthe United States, residing at Paterson, iny the county of Passaic and State of New Jersey,`have invented a certain new and useful Improvement' in Rock-Drills, of which the following is a specification.

The invention relates to drilling apparatus in which a piston reciprocated by steam V.or compressed air delivers blows to a drill,

and the objectrot' vthe invention is to provide an apparatus of this character which shall be light, strong, and efficient, with its working parts constructed and arranged to insure alinement and to reduce wear and the danger and expense of fracture,and also to provide easily operated means for clearing the drilled hole during the drilling operation.`

The invention consistsl inl certain novel features of construction and arrangement by which the above ob]ects areattalned, to

Ibe hereinafter described and claimed.

Figure 1l is an axial section through the working parts of the apparatus, partly in Fig. 2 is a transverse section, partly in end view, the plane of section being indicated by the line 2 2 in Fig. 1. Fig. 3 is an end view of the piston alone. Fig. 4 is an elevation of the end of the striking-pin adapted to be engaged in and struck by said piston. Fig. 5 is an elevation of the opposite end of the striking-pin- Fig isv a sidel view of the same. Fig. 7 is an end view of a collar adapted to hold thek steel or drill and-matchV to the striking-pin. Fig. 8 is an elevation of the opposite `end, of'such collar. Fig. 9 is a side view off thewcollar.

Fig. 10 is a similar view at a right angie to Fig. 9. Fig. 11 is a face view of a washer in which the striking-pin is inclosed "and guided. Fig. 12 is a corresponding edge view.- y

Similar letters of reference indicate the same parts in all the figures. l

A is the cylinder, A1 the fronthead, and A2 the top1h'ead, joined by rods or standardsas usual Ion, thev exterior of the cylinder andlindicated at A? in Fig. 2.

B is the steam,` or compressed air chest Specification of Lettersy Patent.

. Application filed October 21, 1914. Serial No. 867,734. y

having headsjB1 B2 and containinga cylindrical three-ring valve C having ports c c1 and adapted to be reciprocated automati?v cally-tocontrol the admission'fports a al and intermediate exhaust port a2 in the chest rand cylinder and induce the required reciprocatio'ns of the piston D in the-latter. The piston is partially rotated at each return stroke by the engagement of a spiral nut DE' in the piston with a spiral bar A4 mounted in -the cylinder'f equipped with a ratchet wheel A? and a pawl, not shown, operating in the usual mannerL A tubular extension D'a on the front end of the piston and forming a continuation of the latter is grooved on the interior as at l to receive corresponding longitudinal ridges or lands El on the cylindrical rear portion of a striking-pin E matching to and' received telescopically in the extension D2 of the piston and adapted to receive on such inclosed rear end the blows delivered by the piston and transmit their force to the drill or steel M and also by reason of the engagement of the lands and grooves to rotate the striking-pin with the piston.

The steel or drill M is held firmly in a vcylindricalcollar F lnounted in the front head A1 `and having', its upper end notched to provide longitudinally extending wings or lugs F1 F1 inatching to corresponding .spaces between the lugs E2 E2 on the adjacent end of the striking-pin and causing the collar with its steel to rotate ith such pin and with the piston.

Gr is a ring or washer between the cylinder A and the front head A1,y inclosing the cylindrical rear portion of the pin E and serving as a guide therefor.

The .landsE2 are at all times in engage i ment with the grooves 0l of the piston'dun/ ing the reciprocations of the latter, and on the forward or downward movement of the piston thev inclosed upper face of the pin is struck by the adjacent inner face of the piston cavity, and the force of the blow delivered by the nose E3 of thepin to the Steel M.

By making the extension 'D2 of the piston hollow and inclosing the striking-pin therein, lthe latter is always held in position to receive the blow squarely upon its inclosed end, and the whole exterior surface of the extejion is utilized to guide the piston of whid it forms a part and thus insure true axalmovement relatively to the cylinder. The" foseE3 of the striking-pin is similarly in the collar F relatively to the steel M sfoQas to rest squarely thereon, and the ex. treifne distance between the pin and collar aseti f is preferably A tween the washer G and the adjacent end of the` `extension D2 at the end of the normal pisltn travel in delivering a'blow, so that in!I t` e event of an accidental unresisted blow ci `the piston when the drill is not in contact with the rock, the movement will be arrested fthe contact of the extension D2 with the wifsher G and thus transferred directly to th side-rods A3 instead of to the collar F th ough the pin E, thus reducing the danger oftfracture of the front head A1.-

l 'lfhe steel has a continuous axial opening m "nd the pin E is drilled axially at e to ma ich thereto and is grooved annularly as Aat ci. to register with radial holes g in the tvas er G extending from the interior opening fo an external annular groove g1 on the exterior of the' washer. Radial holes e2 lead from the central passage c to the groove e1 and permit water received through a pipe L attached to a hollow boss A6 on the front head A] and communicating with the groove g1 to be delivered through the striking-pin and steel M to the drill-head, not shown, and

- thus to the hole being drilled. The pipe L may be equipped with a valve, not shown, to control the flow.

The passage e in the striking-pinis continued beyond the lateral holes e2 and connects with radial passages e3 communicating with the steam or compressed air space at a3 in the lower end of the cylinder. After each blow, on the admission of pressure to return the piston, a small volume of such steam or air' flows through thestriking-pin and steel and serves to loosen. and blow out dust and drillings from the drilled hole. f It Will be noted that such flow of steam or air is direct from the port a of the cylinder so that the pressure thus delivered through the steel is the full air or steam pressure.

Provisions are also made for delivering a continuous How of steam or air under pressure to the steel M when desired. When the valve C is in the position shown in Fig. 1, steam or air flows through the valve-port c and cylinder port a ton return the piston for the next effective stroke and in this position of the valve the air or steam flows momentarily to the steel as above described; in the head B? of the chest B is an axially arranged push-,pin B3 extending to the interior of the chest and having an exteriorly protruding end B* by w/hich it may be thrust into the chest in oppfosition to the force of a spring B5` inclosed in the head B2, and the valve C thus heldin position to interrupt `the recipgreater than that be rocations of the valve and piston and to admit pressure continuously to the steel for as llonlg7 a period as may be desired.

e push-pin carries a valve Be matching I -to a seat inthe gland BT and preventing leakage around the pin when it is returned by the spring B5 after release.

The valve C is reciprocated automatically -l by the compressed air `or steam throug small ports a4L and passages a controlled by an annular port (l1 on the piston as will be understood.

In clearing the hole being drilled, the i steel is partially withdrawn therefrom or reciprocate'd slowly to produce a churning action therein, and a quantity of water is the hole. The push-pin wardly tomove the valve to the position shownA and hold it there while steam or air under full pressure is delivered to the steel and thence to the drilled hole, blowing out the water with the drillings or chips in parand lugs for engaging the striking-pin` andl collar; the forms shown are considered preferable as aiording the desired engagementv while maintaining axial alinement and permitting the necessary relative movement.

I claim 1,supplied'through the pi e L and steel M to 3 is then forced in-` inn 1. In a rock-drill, a cylinder, a recipro-l eating piston therein having a cavity in its end, and a striking-pin movable relatively to said piston, received in said cavity andv arranged to be inclosed partially within said4 piston in `all positions of the latter.

2. In a rock-drill, a cylinder, a. reciprocating piston therein having an axial cavity in Iits end, and aV striking-pin in axial alinev ment with said piston and loosely received and guided in such cavity.

3. In a rock-drill, a cylinder, a reciproeating piston thereinhaving an axially grooved cavity in its eid, a striking-pin in axial alinement with sald piston and loosely received and guided in such cavity, and lands on said striking-pin matching such grooves.

4. In a rock-drill, acylinder, a reciprocating piston therein having an axially grooved cavity in its end, means for rotating said piston relatively to said cylinder, a strikingpin in axial alinement with said piston and loosely received and guided in said cavity i lands on said ystriking-pin matching such grooves, said pin having longitudinal notches on its exterior, and a drill-carrying collar in axial alinement with said striking-pin and having lugs loosely engaged in said notches, said grooves and' lands, and notches and 'lugs, serving to hold said piston, strikingp-fn and vcollar against longitudinal disengagement and insuring' mutual iotation.

5. In a wok-drill. a cylinder, ahead thereon.l a ivasher held liefxveezi said cylinder and head' and having al central opening, al piston ing' it, said piston having an axial cavity, inits end. a stiikinggpin in axialahneiiient 'with said piston and received'in said cavity' andtopei'iing, a collar `in said head adapted to receive adi-ill, said washer so located relax, tiivel'v .to -said piston a-sto reeeivea 4blow of l the latter uponfsad washer and prevent inipact of said striking-pin upon said collar.

G. VIn a i'ockvdiill, a cylinder, ahead thereon. aivasher held between said head and cylinder and having a central-opening,'v avv piston iusaid cylinder and .means for reciprocating it,A said piston having an axial longitudinal alineinent with said piston and received in saidfravity and opening, a collar in said head adap\ted to lreceive al drill having a',

passage therethrough,y said' washer so. located `relatively to said piston'-l as to. receive a *blow of the latter and prevent impact of said striking-pin upon said collar, said striking-pm and Washer'having.

passages arranged to receive ivaterfaiid deliver it to the'interior of suchdi'ill.

7. In rock-d rilL-a ryl'inder, a head thereon, a washer held between said head and cylinder and having a central opening, a

piston in said cylinde said piston having l niissionvand exhal'ist ports for said cylinder,

said striking-pin having passages for reiving pressure from one of said adniission i'iorts ivlien supplied by' said valve and deliver it to the passage in said drill,`

In testimony that -Ijelaini the invention 'above set forth I atiix my signature` in presence of two witnesses. f

VYARREN Vif-OOD.

`Witnesses;

CiiAuLi-is R. SEARLE, Sorlin: KnrrEL, 

